Lightning detector



FIG. 1 is an elevated frontal perspective view of our new design for a lightening detector;

FIG. 2 is a bottom side perspective view thereof;

FIG. 3 is an elevated right side view thereof, the left side being a mirror image;

FIG. 4 is an elevated front end view thereof;

FIG. 5 is an elevated back end view thereof; and,

FIG. 6 is a top plan view thereof, the bottom plan view being identical.

The broken lines in the drawing illustrate portions of the lightning detector that form no part of the claimed design. 

CLAIM The ornamental design for a lightning detector, as shown and described. 